Depending on whether you set up to emulate North American dialling or international dialling, you can set up a dial plan entry toward the top of your dialling plan to send the numbers you want to block to a number that results in a busy signal or a message.
For example :
Patern: _1900xxxxxx. or _001900xxxxxx.
Replacement: *01055555 (Non-valid Voxalot number)
Provider: Sipbroker
ENUM/Geographic Replacements: No
This replacement reults in a message "We are sorry ......"
Alternately, you can send the call to an (unregistered) provider with no credit which results in a fast busy tone usually.
Some other replacement numbers you can try using, again via Sipbroker:
*258902 (Busy tone)
*266300 (Don't get too carried away with this one ......)
Note that the pattern test is for the full length of the number with the last character being a wildcard. This is to remove the possibility of the check being bypassed by adding an extra character.
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